Paving-roller.



J. GRATTON.

PAVING ROLLER.

APPLICATION FILED OCT. 28.1914

1 ,23?, 63%., Patented Aug. 21, 1917.

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W I TNESSES Imam grating 13 6% W BY I a M fi d/1x 4 flak Z ATTORNEY J. GRATTON.

PAVING ROLLER.

APPLICATION FILED OCT. 28. 19M. 1,237,634. Patented Aug. 21, 1917.

2 SHEETSSHEET 2.

F I J INVENTO WITNESSES: .To/zn Gratin @a/Z ATTORNEY JOHN GRATTON, OF SAN FRANCISCO, CALIFORNIA.

PAVING-ROLLER.

Specification of Letters Patent.

Patented Aug. 21, 1917.

Application filed October 28, 1914. Serial No. 868,946.

To all whom it may concern:

Be it known that I, JOHN Gunmen, a citizen of the United States, reslding at San Francisco, in the county of San Francisco and State of California, have invented new and useful Improvements in Paving- Rollers, of which the following is a specification.

The present invention relates to improvements in street rollers for rolling asphaltic or other pavements, streets and roads.

One object of the invention is to provlde means whereby a street roller can be moved from place to place by means of its own power and thus avoid the necessity of having to use an ordinary truck for transporting the street roller.

A further object is to provide, in conjunction with a street roller of this character, means whereby lumps or high spots in the street pavement can be ground down, out or otherwise reduced.

Furthermore, in this class of work it is very important to be able to apply heat to the pavement to soften the asphalt to permit the pressure rollers to be effectively used thereon. But, while doing so, great care must be exercised to avoid applying so great a heat as to burn, or change the character of, the asphaltum of the pavement. One object of my invention is to provide means for softening by heat, without so injuring, the asphalt.

In the accompanying drawing, Figure 1 is a side view of a street roller equipped with my improvements; Fig. 2 is a longitudinal sectional view of the pressure rollers thereof; Fig. 3 is a plan view of the same; Figs. 4 and 5 are longitudinal sectional views of pressure rollers showing modifications of the means for heating the same; Fig. 6 is a cross sectional view of a pressure roller showing a further modification of said heating means.

Referring to the drawing, 1 indicates a street roller having rear wheels 2 and front pressure rollers 3. Said rollers 3- are each formed integral at both ends with a hollow shaft 59 and are rotatably mounted upon a hollow spindle 4 secured in the lower ends of arms 5 of a yoke 6 extending above the rollers and turned by means of links 7 op-' erated through any suitable mechanism by a motor carried on the street roller.

In order to transport the street roller without having to change the front rollers for that purpose, I provide elevating wheels 9 mounted on stud shafts 11 extending fromvertical slide pieces 12 sliding in vertical guides 13 carried upon the ends of the hollow shaft. Through said guide pieces extend shafts 14 which also extend through extensions 16 of the yoke 6, and carry on their upper ends bevel wheels 17. These bevel wheels are adapted to mesh with bevel wheels 18 on sleeves 19 slidable on, but, by means of a feather 21, rotatable with, a hori-v zontal shaft 22 in bearings 23 supported upon the yoke 6, there being secured to said shaft 22 the bevel pinion 24 meshing with a bevel gear 26 on a vertical stud shaft 27 rotatably mounted in the center of the yoke. With said bevel gear 26 meshes a bevel pinion 28 on a longitudinal shaft 29 operated by said motor 8. When either sleeve 19 is moved to cause its bevel wheel 18 to mesh with the bevel wheel 17 to rotate the vertical shaft 14, said slide pieces are raised or lowered, according to the direction of rotation of the vertical shaft 14, by reason of said shaft 14 having threaded portions 31 extending through threaded holes in lugs 32 extending from said slide pieces 12. Said sleeves 19 are caused to slide on, while being rotatable with, said shaft 22 by means of yokes 33 engaging grooves 34 is said sleeves, said yokes being attached to links 36 passing through slide pieces 37 their ends being connected to arms 81 of bell crank levers 38, other arms of which are connected to the ends of links 39 operable from a convenient part of the machine. By means of this arrangement either elevating wheel 9 can be raised or lowered independently of the other or both can be raised or lowered at the same time. When they are lowered, the front rollers are raised from off the ground, and the machine is able to travel on said elevating wheels and on the rear wheels; when they are raised, the street roller rests on the rear wheels and on the front rollers.

But either elevating wheel may also be used as a cutting and grinding wheel. For this purpose each elevating wheel is provided with bevel teeth 41 which mesh with a bevel pinion 42 slidable on, but rotatable with, a shaft 43, and held between fingers 44 extending from the corresponding slide piece, said shaft 43 rotating in a bearing 46 carried upon the extension 16 of the yoke,

and carrying at its upper end a bevel gear 47 adapted, when the corresponding sleeve '19 is moved longitudinally in the proper direction, to mesh with a bevel gear 48 on said sleeve. By this arrangement one of said elevating wheels can be raised while the other elevating wheel and the front rollers are in their lowered position. While in this raised position the ordinary rubber tire 51 of said elevating wheel can be removed, said tire being on a detachable rim 52, and a rim 53 having an abrading surface can be substituted for the rim 52. Said raised elevating wheel can then be rapidly rotated by means of the shaft 29, pinion 28, gear wheel 26, pinion 24, shaft 22, sleeve 19, bevel gears 46, 47, shaft 43, pinion 42 and bevel teeth 41 so as to rapidly reduce in height any raised portion of the pavement, as shown at 54.

In the form of the invention shown in Fig. 2 the outer ends of the rollers are closed, and steam is admitted to the interior of said hollow spindle by means of a pipe 56 supplied with steam from any suitable source, which pipe communicates with one end of said spindle, said spindle having apertures 57 adapted to register, as the roller sections rotate, with apertures 58 in the central hollow shafts 59 of said sections.

The form of the invention shown in Fig. 4 is suitable where it is intended to heat the roller by the exhaust from a gas engine or by an oil burner. In this form of the invention the rollers are each formed integral with the hollow shaft 59 at the inner end only and the ends of the roller sections having openings 61, through which extend the terminal portions of pipes 62 supported by arms63 secured to the roller spindle, said pipes being connected with a common pipe 64 leading from the exhaust of a gas engine or an oil supply pipe. In this form of the invention, there is provided a water-jacket 66 supplied with water from the roller spindle.

The form of the invention shown in 5- is suitable in cases where the roller is heated by solid fuel. In this case pans 67 for supporting the fuel are suspended by hangers 68 from the tubular axles of the roller sections.

In the form of the invention shown in' Fig. 6' electricity is used for heating the roller. For this urpose there are provided suitably insulated heating coils 69 which are held against the inner surface of the roller between lugs 71 by plates 72 screwed to said lugs. The high resistance wires of said coils are connected to collector rings 7 3 which retate in contact with suitably supported brushes 74 "and electrically connected with any suitable source of electricity.

I claim 1. In a paving roller, the combination of a front roller, a pair of elevating wheels at opposite ends thereof, and means for independently raising or lowering either elevating wheel relative to said roller.

2. In a pavingroller, the combination of a front roller, a pair of elevating wheels at opposite ends thereof, and means for independently rotating either wheel.

3. In a paving roller, the combination of a front roller, a pair of elevating wheels at opposite ends thereof, means for raising 0r lowering said wheels relative to said roller and means for independently rotating either wheel.

4. In a paving roller, the combination of a front roller, a pair of elevating wheels at opposite ends thereof, means for independently raising or lowering either wheel, and means for independently rotating either wheel.

In testimony whereof I have hereunto set my hand in the presence of the subscribing witnesses.

JOHN GRATTON.

Witnesses:

MruroN A. NATHAN, D. B. Rromnns, F. M. WRIGHT. 

